绝大多数科研不端行为是由（）揭露的。
A.普通公众
B.科学家同行
C.主管部门
D.媒体
参考答案：B
人类对地球形状的认识，经历了漫长的过程。下列能够证实地球是球体事件是：
A．魏格纳的大陆漂移假说
B．麦哲伦的环球航行
C．斯科特的南极探险
D．板块构造学说
Rainforests _____ and burned at such a speed that they will disappear from the earth in the near future. [ ]
A. cut
B. are cut
C. are being cut
D. have been cut
